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Fix infinite loop in CupertinoSliverNavigationBar collapse animation by adding bounds check for target scroll position #170210

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@techouse techouse commented Jun 8, 2025

This pull request includes a fix to the CupertinoSliverNavigationBarState class in the nav_bar.dart file. The change ensures that the animateTo method is only called when the target is within the valid scroll extent range, i.e. target <= position.maxScrollExtent.

Fixes #164458

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It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging.

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.If you believe this PR qualifies for a test exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!). The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group.

@github-actions github-actions bot added framework flutter/packages/flutter repository. See also f: labels. f: cupertino flutter/packages/flutter/cupertino repository labels Jun 8, 2025
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techouse commented Jun 8, 2025

@victorsanni, could you please take a look at this once you have a chance? 🙏

I'm not really sure why the Mac_arm64 and Mac_x64 "tool_test_commands" tests are failing. 🤷

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CupertinoSliverNavigationBar's collapse animation can get stuck in an infinite loop
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